<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div class="color"></div>
  </body>
  <style>
    .color {
      width: 100px;
      height: 100px;
      border-radius: 50%;
      background: conic-gradient(#f00,#ff0,#0f0,#0ff,#00f,#f0f)
    }
  </style>
</html>
